Oxygen Diffusion in Perovskite: Implications for Electrical Conductivity in the Lower Mantle
- 23 April 1993
- journal article
- other
- Published by American Association for the Advancement of Science (AAAS) in Science
- Vol. 260 (5107) , 518-521
- https://doi.org/10.1126/science.260.5107.518
Abstract
Experimental determination of oxygen self-diffusion in CaTiO3 perovskite, a structural analog of (Mg,Fe)SiO3 perovskite, confirms a theoretical relation between diffusion constants and anion porosity. Oxygen diffusion rates in (Mg,Fe)SiO3 perovskite calculated with this relation increase by about eight orders of magnitude through the lower mantle. Electrical conductivity values calculated from these diffusion rates are consistent with inferred conductivity values for the lower mantle. This result suggests that the dominant conductivity mechanism in the deep mantle is ionic.Keywords
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